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| Paper: |
Metallicities and Alpha-to-Iron Ratios in Globular Cluster Stars on a
Homogeneous Scale: Search for Multiple Populations |
| Volume: |
491, Fifty Years of Wide Field Studies in the Southern Hemisphere: Resolved Stellar Populations in the Galactic Bulge and the Magellanic Clouds |
| Page: |
134 |
| Authors: |
Dias, B.; Saviane, I.; Barbuy, B.; Held, E.; Da Costa, G.; Ortolani, S.; Vasquez, S. |
| Abstract: |
We are carrying out a survey of 51 poorly studied Milky Way globular
clusters by means of spectroscopy of ∼20 red giant stars per
cluster. Optical spectra (4600-5800 Å) were obtained with
FORS2@VLT/ESO, at a resolution Δλ ∼ 2.5 Å. We
used the ETOILE code to derive radial velocities, Teff,
log g, [Fe/H], and [Mg/Fe] for each star by identifying the best
fitted spectrum among a grid of stellar spectra. The stellar library can be a
collection of observed or synthetic spectra.
The main contributions of this work are to provide
a homogeneous scale of [Fe/H], [Mg/Fe], and radial velocities for
51 clusters (in particular for the 29 distant and/or highly reddened
ones), to provide a catalogue of confirmed member stars for each
cluster, and to identify interesting clusters for follow-up with high
resolution data (e.g., the massive clusters M 22 and NGC 5824, for
which a spread in [Fe/H] was found). |
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